Computational study of the interaction between NO, NO+, and NO- with H2O

Autor(es)

Orenha, Renato P. ; Gregorio, Leticia R. San ; Galembeck, Sergio E.

• Tipo de documento: Artigo Científico
• Fonte: Journal of Molecular Modeling; v. 22, n. 11 NOV 2016.
• Citações Web of Science: 2

Resumo

In this computational study the interaction of NO-, NO+, and NO- with H2O: {[}NO-H2O](center dot) 1., {[}NO-H2O](+), 1(+), and {[}NO-H2O](-), 1-was analysed. The optimized geometries indicate that the relative position of NO and H2O depends on the total charge: (ON center dot-H-OH), (NO--H-OH), and (ON+-OH2). Moreover, atomic spin density along with frontier molecular orbitals help to identify the preferred reduction or oxidation sites on the nitric oxide. Thus, quantum theory of atoms in molecules (QTAIM), electron localization function (ELF), and natural bond-bond polarizability (NBBP) methods aid to quantify the electron delocalization level between NO and H2O, 1+ > 1. > 1-, and show the predominantly ionic, and covalent character to inter-molecular, and intra-molecular chemical bonds, respectively. Furthermore, the natural bond orbital (NBO) and localized molecular orbital energy decomposition analysis (LMO-EDA) methods enable energy analyses of the interaction between NO and H2O in the complexes 1(center dot), 1(+), and 1(-). Where, the first method showed that the interaction between the natural bond orbitals in 1(-) is more favorable, than in 1(+), and less in 1(center dot), however, the second method designates that the total interaction energy is lower for 1(+) in relation to 1(-) and 1(center dot), due mainly to the electrostatic component. As a final point, analysis of the electrostatic potential surfaces provides a clear and direct explanation for the relative position of the monomers. It also shows that the predominant Coulombic attraction between H2O and the charged NO+, andNO-compounds will be stronger in relation to the neutral NO center dot. (AU)

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